I have hotel customer I upgrading OXE from R11.1 to R12 & I have already upgraded my standby OXE with R12 also i restored the net admin to standby OXE Now i have to restore the backup of main OXE to standby OXE also need to do upgrade main OXE to R12 & vice-versa

I have seem sometimes our engineers to take new boards with binaries already loaded. This reduces the time.
Also sometimes they even take another pbx and put basic emergency services that can't go out and put in parallel to the actual pbx. Then they return after all upgrade have been done.

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